1 . 已知向量在向量
上的投影向量的模为
,则
为整数的n的值按照从小到大的顺序排列,得到的新数列的前n项和
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2024-03-21更新
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228次组卷
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2卷引用:广西百所名校2023-2024学年高二下学期入学联合检测数学试题
2 . 设等差数列
的前n项和为
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
______ ,使
为整数的正整数n的值的个数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5efd820db11512606d98aaa9b1b424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f6fef5b0cd6f3ad1a92b1a767452bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cc400b008302822d916e0a68311ae7.png)
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